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Composite ionic liquid catalyst

Inactive Publication Date: 2016-07-14
SHELL OIL CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a new type of catalyst that helps reduce the amount of organic chlorides in alkylate products and increases the production of trimethylpentanes. This catalyst also forms less solids and has a longer lifetime than other catalysts. The patent also discusses the use of composite ionic liquids and their improved stability. The preferred catalyst is a N-butyl, N',N-methylimidazolium composite ionic liquid. Overall, this patent provides a technical solution for reducing organic chlorides in alkylate products and increasing the production of desired compounds.

Problems solved by technology

Although that composite ionic liquid catalyst can suitably be used in alkylation processes as an alternative to HF and sulfuric acid catalysed alkylation processes, the use of the composite ionic liquid catalyst is accompanied with some drawbacks: solids formation in the reaction system during use and the production of organic chlorides as side products.
Solids formation means unwanted catalyst consumption and potential risks of blocking the pipelines in the reaction system.
Further, the presence of organic chlorides in the product undermines the quality of the alkylate and will corrode the engine when used in a fuel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Et3NHCl Composite IL (IL-1)

[0035]Et3NHCl (1 mol) was placed in a 500 mL flask under N2 atmosphere. Subsequently, AlCl3 (0.45 mol) was added into the flask. A reaction started and the solids liquefied. The mixture was stirred while the temperature raised to 100° C. by the exothermic reaction. When the temperature had decreased below 60° C. by cooling to the atmosphere another portion of AlCl3 (0.45 mol) was added to the IL mixture. The temperature of IL rose to 120° C. while cooling to atmosphere. Then CuCl (0.5 mol) was added to the IL mixture. The IL mixture was heated as soon as the temperature started to drop and kept at 120° C. for at least 2 hours by external heating. Then a third portion of AlCl3 (0.45 mol) was added into the flask. The temperature of IL rose to 150° C. The last portion of AlCl3 (0.45 mol) was added into the flask as soon as the temperature started to drop. The temperature of mixture was kept at 150° C. for at least 4 hours using external heatin...

example 2

Preparation of BmimCl Composite IL (IL-2)

[0036]The procedure of example 1 was repeated using butyl methyl imidazolium chloride (BmimCl) (1 mol) instead of Et3NHCl.

example 3

Preparation of [Bmim]C1-1.2AlCl3-0.5CuCl (IL-3)

[0037]1 mol of BmimCl was weighed and put into a 500 mL flask under N2 atmosphere. 133.34 g of AlCl3 (1.0 mol) was weighed and put into the flask, and stirring was started. The solids then started to form a liquid phase. Stirring was continued while the temperature of the IL increased by reaction to 80° C. 50 g of CuCl (0.5 mol) was added into the flask. The mixture was heated after the temperature started to drop. The temperature of the mixture was kept at 120° C. for at least 2 hours. Subsequently, 26.27 g of AlCl3 (0.2 mol) was added into the flask. The temperature of the mixture was kept at 160° C. for 4 hours. Stirring was stopped and the mixture was allowed to cool to room temperature.

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Abstract

The present invention relates to a composite ionic liquid comprising ammonium cations and composite coordinate anions derived from two or more metal salts, wherein at least one metal salt is an aluminium salt and any further metal salt is a salt of a metal selected from the group consisting of Group IB elements of the Periodic Table, Group IIB elements of the Periodic Table and transition elements of the Periodic Table, wherein the ammonium cation is a N,N′-disubstituted imidazolium cation, the substituents independently being selected from C1-C10 alkyl, and C6-C10 aryl. The composite ionic liquid of the invention is a stable catalyst, which can suitably be used to run an ionic liquid alkylation process which produces less solids and an alkylate product comprising less organic chlorides as side products than processes known from the prior art.

Description

FIELD OF THE INVENTION[0001]The present invention provides a new composite ionic liquid catalyst, a process for preparing an alkylate using the new catalyst and a process for the preparation of a composite ionic liquid catalyst.BACKGROUND OF THE INVENTION[0002]There is an increasing demand for alkylate fuel blending feedstock. As a fuel-blending component alkylate combines a low vapour pressure, no sulfur, olefins or aromatics with high octane properties. The most desirable components in the alkylate are trimethylpentanes (TMPs), which have research octane numbers (RONs) of greater than 100. Such an alkylate component may be produced by reacting isobutane with a butene in the presence of a suitable acidic catalyst, e.g. HF or sulfuric acid, although other catalysts such a solid acid catalyst have been reported. Recently, the alkylation of isoparaffins with olefins using an ionic liquid catalyst has been proposed as an alternative to HF and sulfuric acid catalysed alkylation processe...

Claims

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Application Information

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IPC IPC(8): B01J31/02C07C2/58
CPCB01J31/0284B01J31/0279C07C2531/02B01J2231/44C07C2/58C10G50/00C07C2527/122C07C2527/125C10G29/205C10G2300/1092C10G2400/02C10G2400/04C07C9/21C07C9/16
Inventor ZHANG, RUIDE WITH, JANKLUSENER, PETER ANTON AUGUSTLIU, ZHICHANG
Owner SHELL OIL CO